·常規(guī)信息 最近更新:2024年4月21日 10:07:00 | |||||||||||||
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基因(座)名稱 | 絲裂原活化蛋白激酶; 抗水稻細菌性條斑病基因 Mitogen-Activated Protein gene; Bacterial Leaf Streak 1; long grain 6 | ||||||||||||
基因符號 | OsMAPK6; OsMPK6; OsSIPK; DSG1; OsMPK1; BLS1; LOG6 | ||||||||||||
所在染色體 | 6 (已克隆) | ||||||||||||
OsMPK1 (AK111942, Yoo et al. 2013, Reyna et al. 2006), OsMAPK6(AB183398, Lieberherr et al. 2005, Kim et al. 2012), Lee(2008)一文中的OsSIPK, OsMPK6(AK111691, Kishi-Kaboshi et al. 2010, Uji et al. 2019; AK111942, Xie et al. 2012; Os06g06090, Hu et al. 2015, Yi et al. 2016, Guo et al. 2018; Ye et al. 2019, MF537772, Ma et al. 2021), DSG1/OsMAPK6(Os06g0154500, Liu et al. 2015), BLS1(LOC_Os06g06090, Ma et al. 2021), LOG6/OsMAPK6(LOC_Os06g06090, Xiong et al. 2021), 位于同一基因位點... DSG1編碼一個絲裂原活化蛋白激酶(MAPK),具有磷酸化活性,DSG1與AtMAPK6氨基酸序列相似性為84.5%(Liu et al. 2015)。 【突變體表型】過表達BLS1或低表達bls1,能分別減弱或增強水稻對條斑病細菌特定小種JZ-8的抗性。然而,過表達BLS1或低表達bls1都能提高水稻的非小種特異性廣譜抗性。這些結(jié)果表明,BLS1和bls1對Xoc菌株JZ-8的小種特異性抗性具有負調(diào)控作用,而對廣譜抗性具有正調(diào)控作用和負調(diào)控作用(Ma et al. 2021)。 與野生型相比,dsg1突變體明顯矮化,節(jié)間縮短,葉片直立,花藥和籽粒變小,粒長、粒寬及千粒重均顯著降低(Liu et al. 2015)。 抑制OsMPK6表達,可使得水稻穗著粒變密以及籽粒變。℅uo et al. 2018)。 【定位與克隆】利用dsg1和秈稻龍?zhí)仄諛?gòu)建F2分離群體將DSG1定位在47kb區(qū)域內(nèi),序列分析表明Os06g0154500的第6外顯子中有1個堿基缺失,導(dǎo)致移碼和翻譯提前終止(Liu et al. 2015)。 【時空表達譜】OsRac1和異三聚體G蛋白在蛋白水平調(diào)控OsMAPK6(Lieberherr et al. 2005)。 OsMAPK6在多個器官中遍在表達,在小穗和穎殼中表達較高。 【亞細胞定位】細胞核和細胞質(zhì)(Liu et al. 2015) 【生物學(xué)功能】與OsMAPK3一致,OsMAPK6與OsRac1在同一個復(fù)合體中,能活化bHLH轉(zhuǎn)錄因子RAI1,從而激活水稻的免疫應(yīng)答反應(yīng)(Kim et al. 2012)。 OsMAPK6的積累需要OsRac1和Gα這兩個GTP結(jié)合蛋白的參與,OsMAPK6和OsRac1在相同蛋白復(fù)合物中(Lieberherr et al. 2005)。 OsMKK4DD的表達,導(dǎo)致代謝流從糖酵解轉(zhuǎn)向次生代謝物的生物合成,并且細胞的基本活性,如蛋白翻譯和細胞分裂等受到抑制;OsMKK4DD還誘導(dǎo)了多種防衛(wèi)反應(yīng)的發(fā)生,如細胞死亡、雙萜植物抗毒素和木質(zhì)素的合成等,但并不引發(fā)胞外ROS的產(chǎn)生。OsMKK4DD誘導(dǎo)的細胞死亡和雙萜植物抗毒素合成途徑基因的表達是依賴于OsMPK6的,因此,在MAMP引發(fā)的防衛(wèi)反應(yīng)中,OsMKK4-OsMPK6級聯(lián)對植物代謝的重排起著重要作用(Kishi-Kaboshi et al. 2010)。 OsMPK3/OsMPK6能與OsWRKY53發(fā)生互作,活性受后者抑制(Hu et al. 2015)。 OsMAPK6作為一個MAPK,可能位于OsMKK4下游,影響細胞增殖以及油菜素內(nèi)酯信號和穩(wěn)態(tài),在調(diào)控水稻籽粒大小中發(fā)揮重要作用(Liu et al. 2015)。 OsMPK6在水稻早期胚胎發(fā)育時的細胞分化中發(fā)揮重要作用,特別是當(dāng)L1徑向軸形成時(Yi et al. 2016)。 OsMKKK10-OsMKK4-OsMPK6級聯(lián)通路參與水稻穗部形態(tài)建成,作用于共同的通路,GSN1是該通路的負調(diào)控因子(Guo et al. 2018)。 OsER1作用于OsMKKK10-OsMKK4-OsMPK6級聯(lián)信號的上游,與OsMKKK10和OsMKK4聯(lián)合調(diào)控OsMPK6磷酸化水平,通過調(diào)控局部細胞分裂代謝參與水稻穗部形態(tài)建成,是每穗粒數(shù)的負調(diào)控因子。此外,OsMPK6能與DST互作并將其磷酸化,從而增強DST對下游細胞分裂素氧化酶基因OsCKX2的轉(zhuǎn)錄激活能力,促進幼穗發(fā)育過程中細胞分裂素的降解,維持細胞分裂素正常水平。因此,OsER1-OsMKKK10-OsMKK4-OsMPK6信號通路在遺傳上依賴于DST-OsCKX2調(diào)控模塊,通過維持水稻幼穗中細胞分裂素內(nèi)穩(wěn)態(tài)影響水稻幼穗的發(fā)育,最終決定每穗粒數(shù)的形成(Guo et al. 2020)。 OsEDR1通過與一部分OsMPKK10.2互作,抑制了后者的激活;當(dāng)病原菌入侵時,OsMPKK10.2 S304位點被未知的激酶磷酸化,進而激活OsMPK6,后者磷酸化OsEDR1的S861位點,促進OsEDR1的降解,從而釋放更多的OsMPKK10.2,使得OsMPKK10.2-OsMPK6信號級聯(lián)的激活被放大,進而增強水稻的免疫反應(yīng)。這些結(jié)果表明,在OsMPKK10.2-OsMPK6信號級聯(lián)的調(diào)控中,OsEDR1以一個腳手架蛋白的形式參與其中(Ma et al. 2021)。 MAP激酶OsMEK2和OsMPK1信號級聯(lián)參與水稻對稻瘟病菌侵染應(yīng)答、依賴鐵和活性氧(ROS)的細胞鐵死亡反應(yīng)。細胞質(zhì)中的OsMPK1進入細胞核與WRKY90相互作用。稻瘟病菌侵染敲除突變體ΔOsmek2不會引發(fā)鐵和ROS的積累以及脂質(zhì)過氧化,還會下調(diào)OsMPK1、OsWRKY90、OsRbohB和OsPR-1b的表達。而過表達OsMEK2誘導(dǎo)依賴ROS和鐵的細胞死亡。毒性菌株侵染時,過表達下游MAP激酶OsMPK1誘導(dǎo)了ROS和鐵依賴性細胞鐵死亡反應(yīng),鐵死亡抑制劑ferrostatin-1抑制了這種反應(yīng)。然而,稻瘟病菌侵染期間,小分子誘導(dǎo)劑erastin觸發(fā)了依賴鐵和脂質(zhì)ROS、不依賴OsMEK2的細胞鐵死亡。稻瘟病菌侵染后期,ΔOsmek2突變體中與病相關(guān)的細胞死亡是脂質(zhì)ROS依賴性的,但與鐵無關(guān)。這些結(jié)果表明,OsMEK2和OsMPK1的表達正調(diào)節(jié)鐵和ROS依賴性細胞鐵死亡,而稻瘟病相關(guān)的細胞死亡是ROS依賴的、不依賴于鐵(Dangol et al. 2021)。 鹽堿條件下,OsBBX17的表達受抑制。同時,OsMPK1介導(dǎo)的絲裂原活化蛋白激酶級聯(lián)通路的激活導(dǎo)致OsMPK1與OsBBX17互作,并在Thr-95位點磷酸化OsBBX17,從而降低OsBBX17的DNA結(jié)合活性,解除對OsHAK2和OsHAK7的轉(zhuǎn)錄抑制,維持Na+/K+穩(wěn)態(tài),增強鹽堿耐受性。敲除突變體osbbx17-KO具有優(yōu)異的耐鹽堿性,而過表達株OsBBX17-OE相反。此外,過表達OsMPK1顯著提高了對鹽堿的耐受性,但敲除OsMPK1導(dǎo)致敏感性增加。OsBBX17在osmpk1-KO中的進一步過表達導(dǎo)致了極端的鹽堿敏感性,甚至是快速死亡(Shen et al. 2024)。 OsMAPK6介導(dǎo)的OsLIC磷酸化,通過調(diào)節(jié)OsWRKY30轉(zhuǎn)錄,正調(diào)節(jié)水稻對白葉枯病菌(Xoo)和細菌性條斑病菌(Xoc)的抗性。生化分析發(fā)現(xiàn)OsLIC能與OsWRKY30啟動子結(jié)合并抑制其轉(zhuǎn)錄。遺傳分析證實敲除突變體oslic和OsWRKY30過表達系對Xoo和Xoc表現(xiàn)出抗性增強,在oslic中敲除OsWRKY30減弱了對細菌病原體的抗性。OsMAPK6與OsLIC物理互作并磷酸化OsLIC,導(dǎo)致OsLIC對OsWRKY30啟動子的DNA結(jié)合活性降低,從而促進了OsWRKY30的轉(zhuǎn)錄,因此,過表達OsLIC部分抑制了OsMAPK6介導(dǎo)的抗性(Wang et al. 2022)。 【相關(guān)登錄號】
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·ONTOLOGY及相關(guān)基因 | |
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表型特征 | 稻瘟病抗性(TO:0000074), 白葉枯病抗性(TO:0000175), 水稻細菌性條斑病抗性(TO:0000203), 節(jié)間長度(TO:0000145), 籽粒大小(TO:0000397), 葉角(TO:0000206), 每穗實粒數(shù)(TO:0000447), 粒寬(TO:0000402), 粒長(TO:0000734), 雙萜類植保素含量(TO:0002669), 千粒重(TO:0000592), 鈉鉀含量比(TO:0000525), 堿敏感性(TO:0000481), 耐鹽性(TO:0006001) |
分子功能 | 絲裂原活化蛋白激酶活性(GO:0004707) |
生物進程 | 細胞分化(GO:0030154), 胚發(fā)育(GO:0009790), 細胞分裂調(diào)控(GO:0051302), 蛋白磷酸化(GO:0006468), 穗形態(tài)建成(GO:0048281), 鹽脅迫應(yīng)答(GO:0009651), 免疫反應(yīng)(GO:0006955), 有絲分裂調(diào)控(GO:0007346), 細胞周期調(diào)控(GO:0051726), 細胞死亡調(diào)控(GO:0010941), 油菜素甾醇信號通路調(diào)控(GO:1900457), 植保素生物合成調(diào)控(GO:0052319), 細胞增殖調(diào)控(GO:0042127), 種子發(fā)育調(diào)控(GO:0080050), 油菜素甾醇穩(wěn)態(tài)維持(GO:0010268), 細胞分裂素分解(GO:0009823), 抗細菌先天免疫反應(yīng)(GO:0140367), 抗真菌先天免疫反應(yīng)調(diào)控(GO:1905034) |
·參考文獻 |
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